VM: New calling convention for generated code.

runtime/vm/object_x64_test.cc

Index: runtime/vm/object_x64_test.cc
diff --git a/runtime/vm/object_x64_test.cc b/runtime/vm/object_x64_test.cc
index b8914e0ab274737fe76e98587356b2b350e61f05..87727b773233bc327acc1930d433a6a1185b9c5c 100644
--- a/runtime/vm/object_x64_test.cc
+++ b/runtime/vm/object_x64_test.cc
@@ -34,10 +34,14 @@ void GenerateIncrement(Assembler* assembler) {
 void GenerateEmbedStringInCode(Assembler* assembler, const char* str) {
   const String& string_object =
       String::ZoneHandle(String::New(str, Heap::kOld));
+  __ pushq(CODE_REG);
   __ pushq(PP);  // Save caller's pool pointer and load a new one here.
+  __ movq(CODE_REG, Address(CallingConventions::kArg1Reg,
+                            VMHandles::kOffsetOfRawPtrInHandle));
   __ LoadPoolPointer(PP);
   __ LoadObject(RAX, string_object, PP);
   __ popq(PP);  // Restore caller's pool pointer.
+  __ popq(CODE_REG);
   __ ret();
 }